Duet 3 Mainboard 6HC - initial production run.

mundsen

@T3P3Tony so the first Duet 3 are fine ? Exited

Dougal1957

Tony Can you say if a connector kit will be included and also a cable for the SBC or do we need to source our own beforehand? if we do can you list what we need to obtain.

Doug

T3P3Tony

@Dougal1957 Connectors and a 26way to 40 way cable for the SBC (compatible with a Raspberry Pi 3 & 4) will be provided.

Also a SD card with the default image with DuetSoftwareFramework etc installed on it.

Dougal1957

@T3P3Tony said in Duet 3 Mainboard 6HC - initial production run.:

@Dougal1957 Connectors and a 26way to 40 way cable for the SBC (compatible with a Raspberry Pi 3 & 4) will be provided.

Also a SD card with the default image with DuetSoftwareFramework etc installed on it.

Cheers for that

TLAS

@T3P3Tony
Kind of curious why the Duet stayed with the 40 pin connector instead of matching the 26? Was this to enable backwards functionality if used without a SBC? Enable custom expansion? Just too many 40 pin connects on hand?

@TLAS said in Duet 3 Mainboard 6HC - initial production run.:

Kind of curious why the Duet stayed with the 40 pin connector instead of matching the 26?

I think you'll find its the other way around, the connector was reduced from 40 to 26 presumably to save board space.
(iircc the old duet 2 expansion is 50 pin(?), the new only needs 5 signals + ground and potentially 5v if so configured. however earlier raspberry boards aslo use a 26 pin connector, could be related)

Dougal1957

yep the Duet has the 26 and the pi is 40

JoergS5

Aug 10th were some comments in this thread about to use other cables if necessary.

gtj0

@T3P3Tony Can we still use the link in the first post to order even though there might not be any available from the first run?

T3P3Tony

@gtj0 now just yet. I want to be able to say when the next batc will be available first

Dougal1957

Tony is there any chance any more from this first batch will become available I know at least one guy who is desperate to jump on the band waggon. I seem to remember you saying you had kept some back to allow for failures during testing

Doug

PastThePoint

I suppose there is no way to be notified when some stock is available? I have cash in hand for a D3 Mainboard, but missed the pre-order. I don't want to miss the chance to purchase on because I didn't check the website at the right time. So Doug told me to post a comment here as well.

Looking forward to this!

T3P3Tony

@Dougal1957 I expect we will do, will announce more next week.

Dougal1957

@T3P3Tony said in Duet 3 Mainboard 6HC - initial production run.:

@Dougal1957 I expect we will do, will announce more next week.

Thanks I will point him to this.

gtj0

@Dougal1957 said in Duet 3 Mainboard 6HC - initial production run.:

@T3P3Tony said in Duet 3 Mainboard 6HC - initial production run.:

@Dougal1957 I expect we will do, will announce more next week.

Thanks I will point him to this.

Tell him to get to the back of the line.

gtj0

It's a little hard to tell from the renderings and pics but can someone confirm that the 26 pin connector polarity notch faces in towards the MPU?

@gtj0 said in Duet 3 Mainboard 6HC - initial production run.:

It's a little hard to tell from the renderings and pics but can someone confirm that the 26 pin connector polarity notch faces in towards the MPU?

Did you see the new Wiki? https://duet3d.dozuki.com/Wiki/SBC_Setup_for_Duet_3

gtj0

@bearer Yeah but you can't tell in those pics because the cable exits the IDC pins to the left (inwards) but then loops back through the strain relief towards the right and out. I can't see the notch.

@gtj0 I suppose its not given the notch is on the left hand side in those pictures although the red stripe indicating pin 1 would suggest that, which side the cable exits shouldn't affect pin 1 and the notch.

gtj0

I've learned through bitter experience not to take for granted the relationship between the notch and pin 1. About 10 years ago I had a local company make me 100 10-pin cables and they didn't bother to follow my spec. Apparently 3 different people made the cables so I got 3 different orientations.

Anyway, I'm experimenting with different cable lengths and right now I'm getting great results with a 300mm cable at a 1MHz clock rate but only if I alternate the signal lines with grounds. In fact it still looks great at 5HMz. I was toying with using some twisted pair as well but twisted pairs aren't all that effective in unbalanced circuits.